Molarity & dilution worksheet with answers

Free printable Molarity & dilution worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy
1000 mLc = 0.15 mol/L

What mass m of C6H12O6 (M = 180.16 g/mol) do you need to make 1000 mL of a 0.15 mol/L solution?

V = 1000 mLc = 0.15 mol/LM = 180.16 g/mol
m = g
2.Easy
250 mLc = 0.15 mol/L

What mass m of NaOH (M = 40 g/mol) do you need to make 250 mL of a 0.15 mol/L solution?

V = 250 mLc = 0.15 mol/LM = 40 g/mol
m = g
3.Medium
2 mol/LV1​ = ?0.3 mol/L250 mL

You need 250 mL of 0.3 mol/L solution and have a 2 mol/L stock solution. What volume V1 of stock solution do you need?

c1 = 2 mol/Lc2 = 0.3 mol/LV2 = 250 mL
V1 = mL
4.Medium
2.5 mol/LV1​ = ?0.1 mol/L100 mL

You need 100 mL of 0.1 mol/L solution and have a 2.5 mol/L stock solution. What volume V1 of stock solution do you need?

c1 = 2.5 mol/Lc2 = 0.1 mol/LV2 = 100 mL
V1 = mL
5.Hard
0.1 mol/L300 mL2.5 mol/L100 mLc = ?400 mL

300 mL of a 0.1 mol/L solution is mixed with 100 mL of a 2.5 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.1 mol/LV1 = 300 mLc2 = 2.5 mol/LV2 = 100 mL
c = mol/L
6.Hard
0.2 mol/L300 mL0.05 mol/L50 mLc = ?350 mL

300 mL of a 0.2 mol/L solution is mixed with 50 mL of a 0.05 mol/L solution of the same substance. Find the concentration c of the mixture (volumes are additive).

c1 = 0.2 mol/LV1 = 300 mLc2 = 0.05 mol/LV2 = 50 mL
c = mol/L

Answer key

  1. 1. m = 27.02 g
  2. 2. m = 1.5 g
  3. 3. V1 = 37.5 mL
  4. 4. V1 = 4 mL
  5. 5. c = 0.7 mol/L
  6. 6. c = 0.1786 mol/L

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